树。 空格键热键

Question

I want to use spacebar hotkey to expand/collapse nodes. It works perfectly well for enter, and it doesn`t work for space (just select/deselect node). here is my code:

 final Action actionEnter = new ShortcutAction("Select node",
            ShortcutAction.KeyCode.ENTER, null);
    final Action actionSpace = new ShortcutAction("Select node1",
            ShortcutAction.KeyCode.SPACEBAR, null);

    treePanel.addActionHandler(new Action.Handler() {

        @Override
        public void handleAction(Action action, Object sender, Object target) {
            if (action==actionEnter || action==actionSpace){
                Object curId = tree.getValue();
                expandCollapse(curId);
            }
        }

        @Override
        public Action[] getActions(Object target, Object sender) {
            return new Action[] { actionEnter, actionSpace };
        }
    });

What is the problem with space hotkey?

Answer 1

将KeyListener添加到树中，然后可以从那里处理所有事件。